ugly. one night in november 2006 while her husband was away on business, michelle young was attacked in her own bedroom and brutally beaten to death, her body discovered the next day by her sister meredith, along with her two and a half-year-old daughter cassidy, who had been left to wander in her blood. for the investigators who set out to find her killer, no way to get those little footprints out of their minds. sergeant richard spivey, lead investigator. those of us who work in law enforcement, this is our profession, but we're also parents, and that certainly strikes a different note with you when you see something like that. >> michelle's husband, a salesman, was 170 miles away the night of the murder. even so, investigators had to look at him. >> we knew he was the last one to talk with michelle that night, and we know he was the reason she was found.